211623153545 has 8 divisors (see below), whose sum is σ = 254065311240. Its totient is φ = 169220171520.

The previous prime is 211623153523. The next prime is 211623153551. The reversal of 211623153545 is 545351326112.

It can be written as a sum of positive squares in 4 ways, for example, as 54164183824 + 157458969721 = 232732^2 + 396811^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 211623153545 - 2¹⁸ = 211622891401 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211623153499 and 211623153508.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9782030 + ... + 9803639.

It is an arithmetic number, because the mean of its divisors is an integer number (31758163905).

Almost surely, 2^211623153545 is an apocalyptic number.

It is an amenable number.

211623153545 is a deficient number, since it is larger than the sum of its proper divisors (42442157695).

211623153545 is a wasteful number, since it uses less digits than its factorization.

211623153545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19587835.

The product of its digits is 108000, while the sum is 38.

Adding to 211623153545 its reverse (545351326112), we get a palindrome (756974479657).

The spelling of 211623153545 in words is "two hundred eleven billion, six hundred twenty-three million, one hundred fifty-three thousand, five hundred forty-five".